Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

?syswapr

Applies an elementary permutation on the rows and columns of a symmetric matrix.

Syntax

lapack_int
LAPACKE_ssyswapr
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
float
*
a
,
lapack_int
i1
,
lapack_int
i2
);
lapack_int
LAPACKE_dsyswapr
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
double
*
a
,
lapack_int
i1
,
lapack_int
i2
);
lapack_int
LAPACKE_csyswapr
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
lapack_complex_float
*
a
,
lapack_int
i1
,
lapack_int
i2
);
lapack_int
LAPACKE_zsyswapr
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
lapack_complex_double
*
a
,
lapack_int
i1
,
lapack_int
i2
);
Include Files
  • mkl.h
Description
The routine applies an elementary permutation on the rows and columns of a symmetric matrix.
Input Parameters
A
<datatype>
placeholder, if present, is used for the C interface data types in the C interface section above. See C Interface Conventions for the C interface principal conventions and type definitions.
matrix_layout
Specifies whether matrix storage layout is row major (
LAPACK_ROW_MAJOR
) or column major (
LAPACK_COL_MAJOR
).
uplo
Must be
'U'
or
'L'
.
Indicates how the input matrix
A
has been factored:
If
uplo
=
'U'
, the array
a
stores the upper triangular factor
U
of the factorization
A
=
U*D*U
T
.
If
uplo
=
'L'
, the array
a
stores the lower triangular factor
L
of the factorization
A
=
L*D*L
T
.
n
The order of matrix
A
;
n
0.
nrhs
The number of right-hand sides;
nrhs
0.
a
Array of size
at least max
(1,
lda
*
n
)
.
The array
a
contains the block diagonal matrix
D
and the multipliers used to obtain the factor
U
or
L
as computed by
?sytrf
.
i1
Index of the first row to swap.
i2
Index of the second row to swap.
Output Parameters
a
If
info
= 0
, the symmetric inverse of the original matrix.
If
info
=
'U'
, the upper triangular part of the inverse is formed and the part of
A
below the diagonal is not referenced.
If
info
=
'L'
, the lower triangular part of the inverse is formed and the part of
A
above the diagonal is not referenced.
Return Values
This function returns a value
info
.
If
info
= 0
, the execution is successful.
If
info
=
-i
, the
i
-th parameter had an illegal value.
If
info
= -1011
, memory allocation error occurred.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.